Building a plasterboard partition wall

1, The extent of readiness, aligning partition walls

Before building the partition wall, we have to be sure about the following things:

  • the linearity of the floor and the ceiling
  • the place of electric terminations (if you want to have them in the partition wall).

The partition wall can be placed on the ready floor if those conditions that prevent the scathe of the floor and the sound propagation.

Of course, the floor structure must stand the weight of the walls to be built. The alignment of the walls can be done with laser or chalk-line. As it is usual to align the place of wall-frame, do not forget to consider the thickness of the coating.

2, Frame construction made of galvanized steel profiles

The frame of the partition wall consists of the following components:

  • horizontal "head" UW profiles
  • vertical CW profiles

On the CW profiles there are H-shaped grout nicks that serve the lead-through of electric or other installation wires. When CW profiles are shortened try to keep the grout nicks near one end of the profile.

Before placing the boundary profiles of the partition wall (horizontal UW profiles and vertical CW profiles) self-adhesive sponge tapes are glued on them. Then they are affixed to the adjoined constructions (according to the type of the construction) with the help of plastic dowels or other suitable arresters. The distance between the arrestments is maximum 800mm. The first connecting point is maximum 200mm far from the corner.

The presumed deflection of the roof structure is more than 10mm.

The affixation of the partition wall to the ceiling must be done with establishing slip joints. An appropriate number of plasterboard strips should be placed under the UW profiles (for covering the gaps between the coating and the floor structure and because of the anti-burn, acoustic expectations).

Mounting vertical profiles

Vertical CW profiles (UA in certain cases) are placed between the horizontal UW profiles. The length of CW profiles should be chosen in a way that the upper end of the CW profile slides at least 20mm into the upper profile, when the CW profile is placed into the lower UW profile. (This condition has a great importance at the compensation of the bearing floor's deflection, taking the independent dilatation of the partition wall into consideration.) The density of vertical profiles depends on the size of the coating plates, but cannot be more than 625mm. The position of the vertical profiles can be finalized only during mounting the coating. The CW profiles should be placed in a way that its stems are towards the adjustment. The CW profiles are not affixed to the UW profiles (only slide them in without effort). If the CW profiles are made with H holes that serve the leading of installations, the gaps should be at near the same height. If additional lines/wires have to be leaded (e.g. water pipe), we can make holes on the CW profiles on the spot as well.

The following rules go for holes shaped in frame columns:

  • the hole to be shaped must be 10mm narrower than the profile (the hole of the partition wall)
  • the height of the hole (at the lengthwise of the profile) cannot be bigger than the double of its width
  • If more holes are needed in the profile above each other, the distance between them cannot be smaller than the treble of their length
  • The necessary holes are suggested to be shaped on the lower or upper third part of the profile (partition wall)
  • The edge of the hole should be suitable for at least the nominal width of the profile
  • Holes cannot be shaped around the profile joints junctions)

a.) In case of such partition walls that are higher than the standard CW profile, the profiles can be superimposed. The junction is solved with 50cm long auxiliary pieces made of UW profiles in case of CW50 rib-frame, with 75cm in case of CW 75, and with 100cm in case of CW 100. The length of the auxiliary piece is uniformly distributed above and under the junction.

b.) As an alternative solution the lengthening of the CW profiles can be solved by the inosculation of the profiles in opposite direction. In this case the inosculated part cannot be shorter than 50cm. At the end and in the middle of these parts the profiles should be connected with sheet screws.

c.) c.) The lengthening of UA profiles is established with the interposition of an auxiliary piece that is made of the same UA profile. The length of the auxiliary piece is the same as the width of the UA profile in mm. The auxiliary piece bears up uniformly at the place of the joint. The auxiliary piece is affixed to the UA profile by eight M8 bolts with nut and stud-washer,- two-two bolts get to the edge, two-two bolts get to both sides of the profile joints. The lengthening cannot be at the same height on the neighboring columns. The shift of the layers is at least 2 meters. The junction is suggested to be done on the lower of upper third part of the partition wall.

The partition walls can be affixed to double structures The profiles of the double structure can be collided into each other. The neighboring sides of the profiles should be covered with insulator sponge tape. The profiles of the double structure can be placed apart from each other. In this case, the allowed height of the structure decreases. The profiles of the installation partition wall's double structure are clasped at one third height by strips made of plasterboard.

3, Plasterboard and insulation


The plates of the partition wall are usually placed in vertical direction so the longitudinal side of plates is parallel with the vertical profiles. As far as possible, use full-scale plates. Usage of leftover plates for covering is possible if their height is at least 400mm and two or more of them are not built above each other directly. As far as possible use plasterboard plates that are high of level, but plates of smaller format can be also used (e.g. 1200x2000mm, 1000x1500mm). If the partition wall is higher than the plates, a further piece should be cut. In the meanwhile, you have to take care of that the vertical gaps in the neighboring areas should be shifted at least 400mm far from each other, preventing the development of transverse joints. A 10mm wide gap should be left at the floor level that is filled with jointing material.

Mineral-wool insulations:

The mineral-wool insulation is placed into the partition wall after one side is covered with plasterboard and the required electric installations took their place (and health technological installations etc.). The mineral-wool insulations are available for users in coils or panels.

The mineral-wool blanket should be placed continuously into the entire structure. If the insulation material does not fill at least the three-quarters of the hole or does not prove to be stable and deformation resistant, it should be affixed with the help of suspensions to prevent collapse. The affixation takes place once in the upper part of every field and an anchorage can hold a maximum of 3metres high blanket.